This message may occur in the following cases:
You added a project to your solution which is not an ePortal project type. In this case, you can ignore this message.
You added an ePortal presentation project to your solution, but the presentation project was not configured to use the C# language.
The presentation project must use the C# language. The presentation project is still created, but the following steps must be followed to create an appropriate presentation project:
In Solution Explorer, right-click the presentation project, and click Remove.
When asked for a confirmation, click OK.